////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2009-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_display_h)
#define octave_display_h 1

#include "octave-config.h"

#include <string>

class Matrix;

OCTAVE_NAMESPACE_BEGIN

  class display_info
  {
  public:

    // Create object with default values.  To be useful, you must call
    // initialize to find the actual system parameters for the given
    // display.

    display_info (void)
      : m_rx (72), m_ry (72), m_ht (1), m_wd (1), m_dp (0),
        m_dpy_avail (false), m_msg ()
    { }

    ~display_info (void) = default;

    display_info (const display_info&) = default;

    display_info& operator = (const display_info&) = default;

    void initialize (void);

    double x_dpi (void) const { return m_rx; }

    double y_dpi (void) const { return m_ry; }

    int height (void) const { return m_ht; }

    int width (void) const { return m_wd; }

    int depth (void) const { return m_dp; }

    bool display_available (void) const { return m_dpy_avail; }

    std::string message (void) const { return m_msg; }

  private:

    // X- and Y- Resolution of the display in dots (pixels) per inch.
    double m_rx;
    double m_ry;

    // Height, width, and depth of the display.
    int m_ht;
    int m_wd;
    int m_dp;

    bool m_dpy_avail;

    // Message associated with any initiailization failure.  Set if
    // m_dpy_avail is false.
    std::string m_msg;
  };

OCTAVE_NAMESPACE_END

#endif
